/Engine/Source/Editor/StaticMeshEditor/Public/StaticMeshEditorSubsystem.h
Enables/disables mesh section shadow casting for a specific LOD.
void EnableSectionCastShadow ( [UStaticMesh](API\Runtime\Engine\Engine\UStaticMesh) * StaticMesh, bool bCastShadow, int32 LODIndex, int32 SectionIndex )